Malicious PDF — malware analysis report

Static analysis result for SHA-256 237e71334bc62e26…

MALICIOUS

PDF

85.1 KB Created: 2021-08-29 00:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94e56c3cdf634c64b993e7e9460f6805 SHA-1: 7bbab0d9fab5d4ebd20a1a2f43cf3b72c02994e0 SHA-256: 237e71334bc62e263dcee1951224f5aab8adb36ec96a9ac875f6208eeec92929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the nature of the link farm suggests an attempt to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gachbinhduong.com/upload/file/54888409543.pdf In PDF document text
    • http://studioschicchi.eu/userfiles/files/72161057033.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ce26f997---80219369766.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eda2d5cff---nobujevolorage.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c697bebbb9dc91ff00ffe342887c7669/57666294083.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210828230358.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zusiz.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/xeviwagoropuxowerazo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68cb552421---xerukijeruwi.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/9106789943.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f3686319---pijemomisekubefojo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b683e0be50---sokaxodedibupebamovewij.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c50f40d630e2153d7837656e809ab966/23376192898.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992de7227d7---47536392328.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/78992720525.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/50522245217.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a44076e587975ebbb6737a114315caf5/gadox.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/jabogexoxawisabopavujugas.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/01a09fc9a192b5fa9bccff24717aaca2/51292844667.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/19614885712.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/16057023792.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/92721955531.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210818081500_n3nwkg.pdfIn PDF document text
    • https://maturana.cl/upload/file/10565422031.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/fiwegisedijaridi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b0bf2a7fe28fe1178ae7fc4c29195a3d/17252436949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+ambilight+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 10752 bytes
SHA-256: 62b7a98e036c15fb145e826f4ce41447f7f5051dddbc37242dc54ce9e0a30a71
font_01_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 17864 bytes
SHA-256: f1805ac01ba14a9354a79ed0984cd54897860392de0e55f3d7357fec0d44605d
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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